We made sure to see the most famous tidal Bay of Fundy site on our last full day in New Brunswick. We got to the park at peak low tide, and spent a good deal of time wandering around the beach. We reached the end (the site of the emergency shelter) right at the point they were starting to chase people back up the beach. We had about a minute to glance over that section of the beach before we had to head back.
They were also set to close for the season, so we definitely hit at just the right time for the outdoor activities.